Wilson was nowhere near the top (Arthur, Tyrone and Dave in this order) in that poll, as a matter of fact he was close to end up within the 3 least favourite characters (Doug, Eric and Ethan) back then. That was almost 4 months ago, just after v0.5, so things might have changed since then.
I don't like him as a character, but as have been said find their sex scenes kind of hot, and beyond that I think that he fulfills an important role plot-wise and that he is the kind of character "you love to hate". YMMV about that last bit, lol, what I mean is that I don't think all the characters have to be "likeable" in order to have a place in the story.
EDIT: Ash's Dad end 4th in that poll not very far from the top-3 and Jack 5th in no man's land. Just to give a full recap. But things have surely changed since then.